1996 Chevy Truck fast idle

135,000 MILES • V8 • 4WD • AUTOMATIC
Avatar
MRP9MM
  • MEMBER
  • 8 POSTS
I had my alternator go out and once i put in a new one now when you start the truck it revs to about 2000 rpm and then slowly goes back down to 700 rpms, and sometimes when at a stop sign the motor will rev up to about 1000rpms by itself.
I dont think it has anything to do with the alternator.
It has the vortech 5.7
Dec 21, 2009 at 3:11 PM
Advertisement
Avatar
PEAR69
  • ✓Experienced Mechanic
  • 1,482 POSTS
You should put this engine on a computer/engine analyzer. This usually means a trip to a mechanic or the dealer. If there is no trouble light indicated, then it is worth it. The idle in these engines is computer monitored and controlled.
Dec 21, 2009 at 6:41 PM
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Frequently Asked Problems for This Vehicle